Improvement in pumps



PATENT OFFICE.

DAVID S. WOOD, OF DELAVAN, WISCONSIN.

IMPRovEM ENT IN PUMPS.

Specification forming part of Letters Patent No. 54,636, dated May 8,1866.

To all whom it may concern:

Be it known that I, DAVID S. WOOD, of Delavan, in the county of Walworthand State of Wisconsin, have invented a new and useful Improvement inPumps; and I do hereby de clare that the 'following is a t'ull, clear,and exact description ot' the same, reference being had to theaccompanying drawings, and the letters and figures marked thereon, whichform part of this specification.

The nature ot'my said invention consists in a novel arrangement of thepacking upon the piston for the purpose of rendering the same air-tightin the box or chamber in which itreciprocates, which is hereinafterfully set forth and described.

To enable those skilled in the art to mannfacture and make use ot' myinvention, I will proceed to describe the same with particularity,making reference in so doing to the ai'oresaid drawings, in which--Figure l represents a vertical central section of my invention Fig. 2, abottom view ot' the self-adjusting packing, and Fig 3 a top view of thesame.

Similar letters of reference in the several tigures denote correspondingparts of my invention.

A represents the ordinary pump-stock; F, the cylinder or chamber inwhich the piston moves up and down; G, the tubing or pipe leading intothe well; H, a valve opening' up ward; O, the handle whereby the pump isoperated; B, the rod connecting the handle with and is in the form of aring, the central opening of which admits the piston D, which is ofwhich ,consequently seldom needs repair o r renewing.

The operation of' my invention is as follows: As the piston D, which isin form a hollow tube, is moved upward, thereby creating a vacuum in thechamber F, the pressure of the atmosphere forces the packing downward,

'keeping it in its position upon the top of said chamber and i'orcin git closely around the piston and upon'the shoulder on top of saidchamber, and eft'ectually packs and renders the piston air-tight, theonly i'rictional resistance to be overcome in operating the piston beingthat produced by the atmospheric pressure. rlhe packing P is constructedin two parts, as shown in Fig. 2, a a representing oblique edges soarranged that as the friction ot' the piston wears away the interior ot'the packing the pressure of the atmosphere will force the partstogether, the said edges passing by each other, and thus the packing ismade thorough and effectual until it is worn entirely out.

In Fig. 3 are shown two straps which hold the two parts of the packingtogether, while allowing the same to pass by for the purposes specified.

What I claim as my invention, and desire to secure by Letters Patent,is-

The annular packing P, applied around the piston D upon the upper endot' the interior cylinder, substantially as and for the purposespecified.

DAVID S. WOOD. Witnesses:

W. E. MARES, L. L. GOBURN.

